EXPLANATION OF PLATE XIV 



Bumastus beckeri sp. nov., page 54. 

 Fig. 1. Lateral view of the holotype. X V8. 



Figs. 2, 3. Dorsal and lateral views of the paratype in the paleontological 

 collections of the State University of Iowa. X 4/3. 



Fig. 4. Dorsal view of the paratype. Mus. No. P 16708. X 7/&. 



Megalaspis beckeri flBA, sp. nov., page 50. 

 Fig. 5. Dorsal view of the type specimen. X z ^/iS' 



Thaleops ovata Conrad, page 56. 

 Fig. 6. Cranidium. Mus. No. P 11259, Clermont. X I3 /i4- 

 Fig. 7. Dorsal view of a nearly complete specimen from Mineral Point, Wis. 



No. 6901 University of Chicago. X I3 /i4- 



Fig. 8. Cephalon showing cheek spines, from Dixon, 111., No. 12584 University 



of Chicago. X I 3/i 4 . 



Nileus vigilans Meek and Worthen, page 52. 

 Figs. 9-15. Series illustrating variations in size. X 1. 



I 



